lt 171 air filter outer element caterpillar part no 6i2509 make caterpillar warranty period 12 months after the date of delivery lt 171 air filter outer element caterpillar part no 6i2509 make caterpillar warranty period 12 months after the date of delivery lt 263 fuel filter filter as part no 1r0751 make caterpillar warranty period 12 mo nths after the date of delivery